Question about Chevrolet Silverado 1500

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I have a 2003 chevy silverado with a 4.3 liter v-6, its misfireing bad and I have changed the plugs and wires, MAP sensor, and MAF sensor but no change. What could it be.

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  • Jeff Turcotte
    Jeff Turcotte Nov 08, 2010

    could be crankshaft sensor. Is the engine light on? Do you have trouble codes?

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You may need to check the engine timing, that would be the first thing,, 4.3 is also bad about leakes in the fuel lines that are under the intake manifold. this is part of the fuel injection system, it will cause it to rough idle, but will accelerate fine, but when come to stop, will have a rough idle.

Posted on Nov 08, 2010

  • mkmbldr Jan 06, 2011

    I have the same truck and had same problem,it is your distrubritor cap and rotor button. There was a recall on that truck because they ran air condition line over the distributor cap and for some reason the condensation messes up the inside I have had to change mine about every 6 months and it fixes it.

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